Chair back framework



FIG. 1 is a front view of a chair back framework showing our new design;

FIG. 2 is a rear view thereof;

FIG. 3 is a side view, the opposite side view being a mirror image thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof. 

The ornamental design for a chair back framework, as shown and described. 